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Kappa Pegasi—A Quadruple System of Possible Low Total Mass

  • W. R. Beardsley (a1) and M. W. King (a1)

Abstract

Analyses of early Lick Obs. spectra and recent high dispersion Kitt Peak National Obs. spectra indicate that k Peg is a quadruple system having all four spectra visible under favorable conditions. Preliminary spectroscopic orbital elements are presented for the AB system, and for Bb. The Bab system has been found to be the previously known 5.97-day spectroscopic system. The total mass is found to be between 2 and 3 solar masses only. Thus the brightest of the four stars Ba(F5IV) —or possibly all four of the stars—must have an abnormally small mass for its luminosity. This system appears to be similar to several others which have apparent overluminous components. Such systems are of interest in regard to stellar evolution.

Resumen

El análisis de los espectros del Observatorio de Lick y de recientes espectros de alta dispersión del Observatorio de Kitt Peak indican que k Pegasi es un sistema cuádruple con sus cuatro espectros visibles bajo condiciones favorables. Se presentan elementos orbitales espectroscópicos provisionales para el sistema Aab, para el AB y para el Bb. Se ha encontrado que el sistema Bab era el conocido previamente como un sistema espectroscópico de 5.97 días de período. Se ha encontrado que la masa total está solamente entre 2 y 3 masas solares. De esta manera, la más brillante de las cuatro estrellas: Ba (F5IV) —o posiblemente todas las cuatro estrellas—deben tener una masa anormalmente pequeña para su luminosidad. Este sistema parece ser similar a otros tantos que tienen componentes aparentemente superluminosas. Tales sistemas son de interés respecto a la evolución estelar.

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Copyright

References

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Beardsley, W. R., and King, M. W. 1975, in press. (Abstract: Bull AAS, 7, 477).
Burnham, S. W. 1883, Mem. R.A.S., 47, 167.
Couteau, P., and Morel, P. J. 1972, Astron. Astrophys. Suppl., 5, 175.
Hayes, J. C. 1974, An Astrometric Study of Kappa Pegasi, unpublished, M. S. Dissertation, University of Pittsburgh.
Luyten, W. J. 1934, Ap. J., 79, 449.
van de Kamp, P. 1947, A. J., 53, 34.

Kappa Pegasi—A Quadruple System of Possible Low Total Mass

  • W. R. Beardsley (a1) and M. W. King (a1)

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